client/x11: reset screen positions in XMonitor::do_restore

XMonitor::do_restore (called for example when going out of
fullscreen) restore the screen resolution to its previous state,
but it doesn't take care of repositioning the screen to their
previous position, which is one of the advantages of using randr
1.2.
Since MultyMonScreen::restore handles all of this for us, just call
it to restore the monitor position/resolutions to their previous
settings. Before doing any changes, MultyMonScreen::restore checks
if there's something to do, so calling it once per monitor won't be
an issue, the resolution/position will only be set the first time.

This has the side-effect of fixing bug #693431. This bug occurs when
closing the client after the client went in and out of fullscreen.
MultyMonScreen::~MultyMonScreen calls MultyMonScreen::restore, which
decides to change the screen positions since they were lost when going
to fullscreen because XMonitor::restore didn't restore the positions.
After this change, the positions will be properly restored and
MultyMonScreen::restore won't be needlessly called upon client
shutdown.

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